System analysis is traditionally done top-down using structured analysis based on (90) ．Object-oriented analysis focuses on creation of models．The three types of the analysis model are (91) ．There are two substages of object-oriented analysis． (92) focuses on real-world things whose semantics the application captures．The object constructed in the requirement analysis shows the (93) of the real-world system and organizes it into workable pieces． (94) addresses the computer aspects ofthe application that are visible to users．The objects are those which can be expected to vary from time to time quite rapidly．

A．function model，class model and state model
B．class model，interaction model and state model
C．class model，interaction model and sequence model
D．function model，interaction model and state model

案情：张军与张强乃兄弟，张军18岁，张强16岁。二人某日到舞厅跳舞，张军与王某发生口角并打了起来，张强帮其兄张军打王某。派出所对张军、张强每人处以罚款50元的处罚。王某不服，向县公安局申请复议，县公安局变更为各拘留5日，张氏兄弟俩不服。
问题：
1.县公安局的复议决定是否合法为什么